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Colloidal Gelation through Thermally Triggered Surfactant Displacement
Li-Chiun Cheng1, Zachary M Sherman1, James W Swan1
1Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2019
Summary
Researchers engineered colloidal gelation by tuning repulsive interactions using temperature-triggered surfactant displacement. This novel approach creates robust, macroporous viscoelastic networks for soft materials.
Area of Science:
- Soft Matter Physics
- Materials Science
- Colloid Chemistry
Background:
- Colloidal gelation is crucial for developing advanced materials.
- Traditional methods focus on tuning attractive interparticle forces.
- Engineering material properties requires precise control over microstructure.
Purpose of the Study:
- To present a novel platform for controlling colloidal gelation.
- To demonstrate gelation triggered by tuning repulsive interactions.
- To engineer macroporous viscoelastic networks using stimulus-responsive systems.
Main Methods:
- Utilizing amphiphilic oligomers in colloidal suspensions.
- Employing elevated temperatures to induce surfactant displacement.
- Characterizing colloids and constructing interparticle potentials.
- Investigating thermally triggered surfactant displacement.
Main Results:
- Successfully controlled colloidal gelation by decreasing electrostatic repulsion.
- Achieved thermally triggered surfactant displacement.
- Formed macroporous viscoelastic networks.
- Demonstrated robustness across various compositions and colloid parameters.
Conclusions:
- Developed a general, stimulus-responsive gelation platform.
- Offers new strategies for engineering complex soft materials.
- Highlights the importance of repulsive interaction control in colloidal systems.
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